How can the study of children each one unique be a science?

They're all made up of unique strands known as DNA which no one else has. Everything about the body is a biological Wonder so of course scientific study makes perfect sense

Because each child is unique so they each act differently and do stuff/complete stuff in different ways
Sorry if wrong hope this helps

Chapter 1
I will answer as many as I can.

The study of children can be a science because psychologist and scientist often use children in their experiments to test whether their hypothesis will result or their will actually be a deviation. So children are unique in science because often they are used to form data and conclusions ( puberty, adolescence, teenagers).

I don't doubt that their is a connection between ethnicity and development. This can be observed in daily life, we see that most race have different looks and body shapes. This all has to do with development.

Biosocial- social biology, relating to body language , non verbal messages, and such
psychosocial- the psychology of sociology , relating to the brain and thinking behind socializing
Cognitive- the wiring of the brain, connection between thinking and making decision

Chapter 2

A theory is something believed to exist as truth, as result of scientific experimentation and conduction.

A fact is something that can t be disproven, and is often undebatable.

Theories given explanation, provide reason, and clarify questions that can be asked.

Chapter 3

Chromosomes are bit of DNA that is located in genes. Every living organism has 32 chromosomes.

All humans are similar because we are one human race who all are born into each other. There will always be similarities between humans as long as every child has a mom and dad. Children are often a resemblance of their parents ( that is what genetics is and what genes does)

Chapter 4

There is no most important parts that form in a fetus. While a child is in their mothers womb every moment that fetus is growing and forming into a soon to be born baby is important .

For starters, every child can exhibit certain traits, based on their upbringing, economic standing, and even the place where they reside, can dictate how they act and how they present themselves. Scientist usually study children to either prove their hypothesis right or wrong. Studying children can give scientist as base guideline as to how children behave and the similarities and differences between them, and their development in their life cycle. The same goes for studying Adolescents, Young adults, and so on and so forth.

Studying their social behaviors (social science).

The study of children can be a study of science because psychologists and scientists often use children in their experiments to test whether their hypothesis will result or their will actually be a deviation. So children are unique in science because often they are used to form data and conclusions.